linux-kernel - Re: [Xen-devel] [PATCH v2 9/9] xen/gntdev: Expose gntdev's dma-buf API for in-kernel use

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Date:   Thu, 7 Jun 2018 10:33:41 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Dongwon Kim <dongwon.kim@...el.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     matthew.d.roper@...el.com, jgross@...e.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        daniel.vetter@...el.com, xen-devel@...ts.xenproject.org,
        linux-media@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH v2 9/9] xen/gntdev: Expose gntdev's dma-buf
 API for in-kernel use

On 06/07/2018 01:05 AM, Dongwon Kim wrote:
> On Wed, Jun 06, 2018 at 05:51:38PM -0400, Boris Ostrovsky wrote:
>> On 06/06/2018 08:46 AM, Oleksandr Andrushchenko wrote:
>>> On 06/05/2018 01:36 AM, Boris Ostrovsky wrote:
>>>> On 06/01/2018 07:41 AM, Oleksandr Andrushchenko wrote:
>>>>> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
>>>>>
>>>>> Allow creating grant device context for use by kernel modules which
>>>>> require functionality, provided by gntdev. Export symbols for dma-buf
>>>>> API provided by the module.
>>>> Can you give an example of who'd be using these interfaces?
>>> There is no use-case at the moment I can think of, but hyper dma-buf
>>> [1], [2]
>>> I let Intel folks (CCed) to defend this patch as it was done primarily
>>> for them
>>> and I don't use it in any of my use-cases. So, from this POV it can be
>>> dropped,
>>> at least from this series.
>>
>> Yes, let's drop this until someone actually needs it.
>>
>> -boris
> I agree. We are working on re-architecturing hyper_dmabuf. We would use zcopy
> apis however, not sure if we are going to do it from kernel or from userspace.
> So please do not expose those for now.
Ok, as we are all on the same page for that then I'll drop this patch 
for now
>>
>>>> -boris
>>>>
>>> [1] https://patchwork.freedesktop.org/series/38207/
>>> [2] https://patchwork.freedesktop.org/patch/204447/
>>>
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@...ts.xenproject.org
>>> https://lists.xenproject.org/mailman/listinfo/xen-devel

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